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freebsd-nq/sys/dev/acpica/acpi_pcib.c
John Baldwin 2ccfc93222 Overhaul the ACPI PCI bridge driver a bit: 
- Add an ACPI PCI-PCI bridge driver (the previous driver just handled
  Host-PCI bridges) that is a PCI driver that is a subclass of the generic
  PCI-PCI bridge driver.  It overrides probe, attach, read_ivar, and
  pci_route_interrupt.
  - The probe routine only succeeds if our parent is an ACPI PCI bus which
    we test for by seeing if we can read our ACPI_HANDLE as an ivar.
  - The attach routine saves a copy of our handle and calls the new
    acpi_pcib_attach_common() function described below.
  - The read_ivar routine handles normal PCI-PCI bridge ivars and adds an
    ivar to return the ACPI_HANDLE of the bus this bridge represents.
  - The route_interrupt routine fetches the _PRT (PCI Interrupt Routing
    Table) from the bridge device's softc and passes it off to
    acpi_pcib_route_interrupt() to route the interrupt.
- Split the old ACPI Host-PCI bridge driver into two pieces.  Part of
  the attach routine and most of the route_interrupt routine remain in
  acpi_pcib.c and are shared by both ACPI PCI bridge drivers.
  - The attach routine verifies the PCI bridge is present, reads in
    the _PRT for the bridge, and attaches the child PCI bus.
  - The route_interrupt routine uses the passed in _PRT to route a PCI
    interrupt.
  The rest of the driver is the ACPI Host-PCI bridge specific bits that
  live in acpi_pcib_acpi.c.
  - We no longer duplicate pcib_maxslots but use it directly.
  - The driver now uses the pcib devclass instead of its own devclass.
    This means that PCI busses are now only children of pcib devices.
  - Allow the ACPI_HANDLE for the child PCI bus to be read as an ivar
    of the child bus.
  - Fetch the _PRT for routing PCI interrupts directly from our softc
    instead of walking the devclass to find ourself and then fetch our
    own softc.

With this change and the new ACPI PCI bus driver, ACPI can now properly
route interrupts for devices behind PCI-PCI bridges.  That is, the
Itanium2 with like 10 PCI busses can now boot ok and route all the PCI
interrupts.  Hopefully this will also fix problems people are having with
CardBus bridges behind PCI-PCI bridges not properly routing interrupts
when ACPI is used.

Tested on:	i386, ia64
2002-08-26 18:30:27 +00:00

339 lines
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/*-
* Copyright (c) 2000 Michael Smith
* Copyright (c) 2000 BSDi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include "acpi.h"
#include <dev/acpica/acpivar.h>
#include <dev/acpica/acpi_pcibvar.h>
#include <machine/pci_cfgreg.h>
#include <pci/pcivar.h>
#include <pci/pcib_private.h>
#include "pcib_if.h"
/*
* Hooks for the ACPI CA debugging infrastructure
*/
#define _COMPONENT ACPI_BUS
ACPI_MODULE_NAME("PCI")
int
acpi_pcib_attach(device_t dev, ACPI_BUFFER *prt, int busno)
{
device_t child;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
/*
* Don't attach if we're not really there.
*
* XXX: This isn't entirely correct since we may be a PCI bus
* on a hot-plug docking station, etc.
*/
if (!acpi_DeviceIsPresent(dev))
return_VALUE(ENXIO);
/*
* Make sure that this bus hasn't already been found.
*/
if (devclass_get_device(devclass_find("pci"), busno) != NULL) {
device_printf(dev, "duplicate bus number %d - not probing bus\n",
busno);
return_VALUE(0);
}
/*
* Get the PCI interrupt routing table for this bus.
*/
prt->Length = ACPI_ALLOCATE_BUFFER;
status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt);
if (ACPI_FAILURE(status))
/* This is not an error, but it may reduce functionality. */
device_printf(dev, "could not get PCI interrupt routing table - %s\n",
AcpiFormatException(status));
/*
* Attach the PCI bus proper.
*/
if ((child = device_add_child(dev, "pci", busno)) == NULL) {
device_printf(device_get_parent(dev), "couldn't attach pci bus");
return_VALUE(ENXIO);
}
/*
* Now go scan the bus.
*
* XXX It would be nice to defer this and count on the nexus getting it
* after the first pass, but this does not seem to be reliable.
*/
return_VALUE(bus_generic_attach(dev));
}
/*
* Route an interrupt for a child of the bridge.
*
* XXX clean up error messages
*
* XXX this function is somewhat bulky
*/
int
acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin,
ACPI_BUFFER *prtbuf)
{
ACPI_PCI_ROUTING_TABLE *prt;
ACPI_HANDLE lnkdev;
ACPI_BUFFER crsbuf, prsbuf;
ACPI_RESOURCE *crsres, *prsres, resbuf;
ACPI_DEVICE_INFO devinfo;
ACPI_STATUS status;
u_int8_t *prtp;
int interrupt;
int i;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
crsbuf.Pointer = NULL;
prsbuf.Pointer = NULL;
interrupt = 255;
/* ACPI numbers pins 0-3, not 1-4 like the BIOS */
pin--;
prtp = prtbuf->Pointer;
if (prtp == NULL) /* didn't get routing table */
goto out;
/* scan the table looking for this device */
for (;;) {
prt = (ACPI_PCI_ROUTING_TABLE *)prtp;
if (prt->Length == 0) /* end of table */
goto out;
/*
* Compare the slot number (high word of Address) and pin number
* (note that ACPI uses 0 for INTA) to check for a match.
*
* Note that the low word of the Address field (function number)
* is required by the specification to be 0xffff. We don't risk
* checking it here.
*/
if ((((prt->Address & 0xffff0000) >> 16) == pci_get_slot(dev)) &&
(prt->Pin == pin)) {
if (bootverbose)
device_printf(pcib, "matched entry for %d.%d.INT%c (source %s)\n",
pci_get_bus(dev), pci_get_slot(dev), 'A' + pin, prt->Source);
break;
}
/* skip to next entry */
prtp += prt->Length;
}
/*
* If source is empty/NULL, the source index is the global IRQ number.
*/
if ((prt->Source == NULL) || (prt->Source[0] == '\0')) {
if (bootverbose)
device_printf(pcib, "device is hardwired to IRQ %d\n",
prt->SourceIndex);
interrupt = prt->SourceIndex;
goto out;
}
/*
* We have to find the source device (PCI interrupt link device)
*/
if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) {
device_printf(pcib, "couldn't find PCI interrupt link device %s\n",
prt->Source);
goto out;
}
/*
* Verify that this is a PCI link device, and that it's present.
*/
if (ACPI_FAILURE(AcpiGetObjectInfo(lnkdev, &devinfo))) {
device_printf(pcib, "couldn't validate PCI interrupt link device %s\n",
prt->Source);
goto out;
}
if (!(devinfo.Valid & ACPI_VALID_HID) || strcmp("PNP0C0F", devinfo.HardwareId)) {
device_printf(pcib, "PCI interrupt link device %s has wrong _HID (%s)\n",
prt->Source, devinfo.HardwareId);
goto out;
}
if (devinfo.Valid & ACPI_VALID_STA && (devinfo.CurrentStatus & 0x9) != 0x9) {
device_printf(pcib, "PCI interrupt link device %s not present\n",
prt->Source);
goto out;
}
/*
* Get the current and possible resources for the interrupt link device.
*/
crsbuf.Length = ACPI_ALLOCATE_BUFFER;
if (ACPI_FAILURE(status = AcpiGetCurrentResources(lnkdev, &crsbuf))) {
device_printf(pcib, "couldn't get PCI interrupt link device _CRS data - %s\n",
AcpiFormatException(status));
goto out; /* this is fatal */
}
prsbuf.Length = ACPI_ALLOCATE_BUFFER;
if (ACPI_FAILURE(status = AcpiGetPossibleResources(lnkdev, &prsbuf))) {
device_printf(pcib, "couldn't get PCI interrupt link device _PRS data - %s\n",
AcpiFormatException(status));
/* this is not fatal, since it may be hardwired */
}
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "got %d bytes for %s._CRS\n", crsbuf.Length, acpi_name(lnkdev)));
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "got %d bytes for %s._PRS\n", prsbuf.Length, acpi_name(lnkdev)));
/*
* The interrupt may already be routed, so check _CRS first. We don't check the
* 'decoding' bit in the _STA result, since there's nothing in the spec that
* mandates it be set, however some BIOS' will set it if the decode is active.
*
* The Source Index points to the particular resource entry we're interested in.
*/
if (ACPI_FAILURE(acpi_FindIndexedResource(&crsbuf, prt->SourceIndex, &crsres))) {
device_printf(pcib, "_CRS buffer corrupt, cannot route interrupt\n");
goto out;
}
/* type-check the resource we've got */
if (crsres->Id != ACPI_RSTYPE_IRQ) { /* XXX ACPI_RSTYPE_EXT_IRQ */
device_printf(pcib, "_CRS resource entry has unsupported type %d\n",
crsres->Id);
goto out;
}
/* if there's more than one interrupt, we are confused */
if (crsres->Data.Irq.NumberOfInterrupts > 1) {
device_printf(pcib, "device has too many interrupts (%d)\n",
crsres->Data.Irq.NumberOfInterrupts);
goto out;
}
/*
* If there's only one interrupt, and it's not zero, then we're already routed.
*
* Note that we could also check the 'decoding' bit in _STA, but can't depend on
* it since it's not part of the spec.
*
* XXX check ASL examples to see if this is an acceptable set of tests
*/
if ((crsres->Data.Irq.NumberOfInterrupts == 1) && (crsres->Data.Irq.Interrupts[0] != 0)) {
device_printf(pcib, "device is routed to IRQ %d\n",
crsres->Data.Irq.Interrupts[0]);
interrupt = crsres->Data.Irq.Interrupts[0];
goto out;
}
/*
* There isn't an interrupt, so we have to look at _PRS to get one.
* Get the set of allowed interrupts from the _PRS resource indexed by SourceIndex.
*/
if (prsbuf.Pointer == NULL) {
device_printf(pcib, "device has no routed interrupt and no _PRS on PCI interrupt link device\n");
goto out;
}
if (ACPI_FAILURE(acpi_FindIndexedResource(&prsbuf, prt->SourceIndex, &prsres))) {
device_printf(pcib, "_PRS buffer corrupt, cannot route interrupt\n");
goto out;
}
/* type-check the resource we've got */
if (prsres->Id != ACPI_RSTYPE_IRQ) { /* XXX ACPI_RSTYPE_EXT_IRQ */
device_printf(pcib, "_PRS resource entry has unsupported type %d\n",
prsres->Id);
goto out;
}
/* there has to be at least one interrupt available */
if (prsres->Data.Irq.NumberOfInterrupts < 1) {
device_printf(pcib, "device has no interrupts\n");
goto out;
}
/*
* Pick an interrupt to use. Note that a more scientific approach than just
* taking the first one available would be desirable.
*
* The PCI BIOS $PIR table offers "preferred PCI interrupts", but ACPI doesn't
* seem to offer a similar mechanism, so picking a "good" interrupt here is a
* difficult task.
*
* Build a resource buffer and pass it to AcpiSetCurrentResources to route the
* new interrupt.
*/
device_printf(pcib, "possible interrupts:");
for (i = 0; i < prsres->Data.Irq.NumberOfInterrupts; i++)
printf(" %d", prsres->Data.Irq.Interrupts[i]);
printf("\n");
if (crsbuf.Pointer != NULL) /* should never happen */
AcpiOsFree(crsbuf.Pointer);
crsbuf.Pointer = NULL;
resbuf.Id = ACPI_RSTYPE_IRQ;
resbuf.Length = ACPI_SIZEOF_RESOURCE(ACPI_RESOURCE_IRQ);
resbuf.Data.Irq = prsres->Data.Irq; /* structure copy other fields */
resbuf.Data.Irq.NumberOfInterrupts = 1;
resbuf.Data.Irq.Interrupts[0] = prsres->Data.Irq.Interrupts[0]; /* just take first... */
if (ACPI_FAILURE(status = acpi_AppendBufferResource(&crsbuf, &resbuf))) {
device_printf(pcib, "couldn't route interrupt %d via %s, interupt resource build failed - %s\n",
prsres->Data.Irq.Interrupts[0], acpi_name(lnkdev), AcpiFormatException(status));
goto out;
}
if (ACPI_FAILURE(status = AcpiSetCurrentResources(lnkdev, &crsbuf))) {
device_printf(pcib, "couldn't route interrupt %d via %s - %s\n",
prsres->Data.Irq.Interrupts[0], acpi_name(lnkdev), AcpiFormatException(status));
goto out;
}
/* successful, return the interrupt we just routed */
device_printf(pcib, "routed interrupt %d via %s\n",
prsres->Data.Irq.Interrupts[0], acpi_name(lnkdev));
interrupt = prsres->Data.Irq.Interrupts[0];
out:
if (crsbuf.Pointer != NULL)
AcpiOsFree(crsbuf.Pointer);
if (prsbuf.Pointer != NULL)
AcpiOsFree(prsbuf.Pointer);
/* XXX APIC_IO interrupt mapping? */
return_VALUE(interrupt);
}
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